布局文件，我如何列出布局中的内容

Question

我希望在所有页面的布局侧面菜单中查看国家/地区列表，州列表和城市列表。

<div class="container side-menu">

            <div class="row">
                <div class="col-md-3">
                    <?php $countries = array();?>
                    <select class="form-control">
                        <option value="">All</option>
                        <?php foreach($countries as $country) { ?>
                        <?php echo "<option>".$country['name']."</option>"; ?>
                        <?php } ?>
                    </select>
                </div>

                <div class="col-md-3">
                    <?php $categories = array(); ?>
                    <select class="form-control">
                        <option value="">All</option>
                        <?php foreach($categories as $category) { ?>
                        <?php echo "<option>".$category['name']."</option>"; ?>
                        <?php } ?>
                    </select>
                </div>